Improvement in blow-off cocks



B. B. HARROP. Blow-Off Cook.

No. 218,264. Patented Aug. 5,1879.

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A Z I 1 G I Y 11 4 W- 3 v I C I 1 I F I QT N. PETERS. FHOYO-LITHGGRAPHER. WASHINGTON. D C

UNITED STATES PATENT OFFICE.

BENJAMIN B. HARROP, OF HARRISBURG, TEXAS.

IMPROVEMENT IN BLOW-OFF COCKS.

Specification forming part of Letters Patent No. 218,264, dated August 5, 1879; application filed May 22, 1879.

To all whom it may concern:

Be it known that I, BENJAMIN B. HARROP, of Harrisburg, Harris county. Texas, have invented a new and useful Improvement in Blow-Off Cocks, of which the following is a specification.

My invention relates to an improved form of blow-oft cooks for locomotive and other steam-boilers in which a conical valve is employed, that is kept closed by the pressure of the confined fluid, and is opened by a suitable lever, which is external to the globe or casing of the cock. In my improvement the operating-lever is connected, by means of a suitable yoke or stirrup, with that end of the valvestem which is external to the casing.

In the accompanying drawings, Figure 1 is an axial section of a cock embodying my invention, the valve being shown open. Fig. 2 is a perspective view of the stirrup.

A represents the globe, shell, or casing; B, its inlet, provided with screw-neck b, for attachment to the boiler or cylinder.

0 is the outlet, whose screw-neck 0 receives the nut D, for attachment of the dischargepipe.

A diaphragm, E, is pierced with customary conical seat 6 for valve F, whose stem Gr passes out through a stuffingbox, H, in the case, and has a screw-threaded extremity, g, to receive nuts I J, which fasten it to a yoke or stirrup, K, whose other end terminates in a perforated shank, L, to enable the coupling to it of a custornary crank or lever.

I claim as new and of my invention- A blow-oft cock consisting of the shell A B O D E H, valve F G, nuts I J, and the operative yoke or stirrup K, substantially as set forth.

In testimony of which invention I hereunto set my hand.

BENJAMIN BERNARD HARROP.

Attest:

BEEN A. HILL, JAMES ALEXANDER. 

